Nitric oxide (NO) serves as a local signal for vasodilation because it ____
a. is broken down quickly
b. dissipates quickly
c. recycles rapidly in cells
d. counteracts the action of oxygen
e. blocks adrenergic receptors
ANSWER: a
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A defining characteristic of eukaryotic organisms is that they
A. have their transcription occurring in the cytoplasm and translation in the nucleus. B. have their transcription occurring in the nucleus and translation in the cytoplasm. C. have only operons to assist in gene expression. D. carry out protein synthesis only in the presence of the cAMP molecule. E. use the leucine zipper primarily for the production of the amino acid tryptophan.
Quality control is performed to test the validity of catalase production at 68°C. M. fortuitum and M. tuberculosis are used, which yield a positive and negative reaction, respectively. Which one of the following statements explains this discrepancy?
a. Both organisms were most likely incu-bated at the wrong temperature. b. Both organisms were most likely incu-bated on the wrong media before testing. c. The catalase reagent is most likely expired. d. No discrepancy is present. M. fortuitum is catalase-positive and M. tuberculosis is catalase-negative at 68°C.
What would happen if sister chromatids did not break apart during anaphase of mitosis? What will be an ideal response?
Hemophilia is characterized by ____
a. defects in the mechanism of blood clotting b. an extremely low blood iron level c. jaundice of the eyes and skin d. muscular weakness and atrophy e. breathing difficulties